Jump to content

Mars landing

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by Jrcraft Yt (talk | contribs) at 08:30, 27 March 2020 (Mars 3). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Animation of a Mars landing touchdown, the InSight lander in 2018
Main article: Exploration of Mars

A Mars landing is a landing of a spacecraft on the surface of Mars. Of multiple attempted Mars landings by robotic, unmanned spacecraft, nine have successful soft landed. There have also been studies for a possible human mission to Mars, including a landing, but none have been attempted. The most recent landing took place on 26 November 2018 by the NASA probe InSight.

Methods of descent and landing

As of October 2016, all methods of landing on Mars have required an aeroshell and parachute sequence for Mars atmospheric entry and descent, but after that three different methods have been used to date. A lander can drop from the parachute back shell and ride retrorockets all the way down, but a rover cannot be burdened with rockets that serve no purpose after touchdown.

One method for lighter rovers is to enclose the rover in a tetrahedral structure which in turn is enclosed in airbags. After the aeroshell drops off, the tetrahedron is lowered clear of the parachute back shell on a tether so that the airbags can inflate. Retrorockets on the back shell can slow descent. When it nears the ground, the tetrahedron is released to drop to the ground, using the airbags as shock absorbers. When it has come to rest, the tetrahedron opens to expose the rover.

If a rover is too heavy to use airbags, the retrorockets can be mounted on a sky crane. The sky crane drops from the parachute back shell and, as it nears the ground, the rover is lowered on a tether. When the rover touches ground, it cuts the tether so that the sky crane (with its rockets still firing) will crash well away from the rover.[1]

Landing in an airbag
Artistic depiction of MSL Curiosity rover being lowered from the Skycrane
The MSL Descent Stage under construction on Earth

Descent of heavier payloads

For landers that are even heavier than the Curiosity rover (which required a 4.5 meter (15 feet) diameter aeroshell), engineers are developing a combination rigid-inflatable Low-Density Supersonic Decelerator that could be 8 meters (28 feet) in diameter. It would have to be accompanied by a proportionately larger parachute.[2]

Landing challenges

Landing robotic spacecraft and humans on Mars has become one of the technological needs for humans. In the sequence of transit to Mars one of the most challenging tasks for the lander is to perform a successful soft-landing without any issue. For a favorable landing, the lander module has to come up with challenges like[3][4]

In recent years, NASA have successfully landed "InSight Mars Lander" on the surface of Mars harnessing Viking era technology.[5] But this technology cannot afford us to land large number of cargoes, habitats, ascent vehicles and humans in case of manned Mars missions in near future. In order to improve and accomplish this intent, we need to upgrade our technologies and launch vehicles. For a successive soft-landing using current technology, some of the considerable factors for a lander such as:[6][3]

Communicating with Earth

Beginning with the Viking program,[a] all landers on the surface of Mars, aside from Mars Pathfinder, have used orbiting spacecraft as communications satellites for relaying their data to Earth. The landers use UHF transmitters to send their data to the orbiters, which then relay the data to Earth using either X band or Ka band frequencies. These higher frequencies, along with more powerful transmitters and larger antennas, permit the orbiters to send the data much faster than the landers could manage transmitting directly to Earth, which conserves valuable time on the receiving antennas.[7]

Landing site locations

Map of Mars
Interactive image map of the global topography of Mars, overlaid with the position of Martian rovers and landers. Coloring of the base map indicates relative elevations of Martian surface.
Clickable image: Clicking on the labels will open a new article.
(   Active •   Inactive •   Planned)
Bradbury Landing
Deep Space 2
Mars Polar Lander
Perseverance
Schiaparelli EDM
Spirit
Viking 1

Uncrewed landings

Insight Mars lander view in December 2018

In 1970s several Soviet Mars and American Viking landers made it to the surface and provided several years of images and data, however there was not another Mars lander until 1997 when Mars Pathfinder landed.[8] In the 21st century there were several successful landings, but there have also been many crashes.[8]

Mars probe program

The first probe intended to be a Mars impact lander was the Soviet Mars 1962B unsuccessfully launched in 1962.[9]

In 1971 the Soviet Union successfully sent probes Mars 2 and Mars 3, as part of the Mars probe program M-71. The Mars 2 and 3 probes each carried a lander. The Mars 2 lander failed to land and impacted Mars. The Mars 3 lander became the first probe to successfully soft land on Mars. The lander began transmitting to the Mars 3 orbiter 90 seconds after landing. After 14.5 seconds, transmission ceased for unknown reasons. The cause of the failure may have been related to the extremely powerful Martian dust storm taking place at the time. These space probes each contained a Mars rover, although they were never deployed.

The Mars 2 and 3 orbiters sent back a large volume of data covering the period from December 1971 to March 1972, although transmissions continued through to August. By 22 August 1972, after sending back data and a total of 60 pictures, Mars 2 and 3 concluded their missions. The images and data enabled creation of surface relief maps, and gave information on the Martian gravity and magnetosphere.[10]

In 1973, the Soviet Union sent four more probes to Mars: the Mars 4 and Mars 5 orbiters and the Mars 6 and Mars 7 fly-by/lander combinations. All missions except Mars 7 sent back data, with Mars 5 being most successful. Mars 5 transmitted 60 images before a loss of pressurization in the transmitter housing ended the mission. The Mars 6 lander transmitted data during descent, but failed upon impact. Mars 4 flew by the planet at a range of 2200 km, returning one swath of pictures and radio occultation data, which constituted the first detection of the nightside ionosphere on Mars.[11] The Mars 7 probe separated prematurely from the carrying vehicle due to a problem in the operation of one of the onboard systems (attitude control or retro-rockets) and missed the planet by 1,300 km (810 mi).

Years earlier, in 1970 Soviet Union began the design of Mars 4NM and Mars 5NM missions with super-heavy uncrewed Martian spacecraft. First was Marsokhod with planned date of start in 1973 and second was Mars sample return mission planned for 1975. Both spacecraft were intended to be launched on the N1 superrocket, but this rocket never flew successfully and the Mars 4NM and Mars 5NM projects were cancelled.[12]

Later, double-launching Mars 5M (Mars-79) sample return mission was planned for 1979, but cancelled due to complexity and technical problems.[citation needed]

Viking program

Viking 1 landing site (click image for detailed description).

In 1976 the two American Viking probes entered orbit about Mars and each released a lander module that both made successful soft landings on the planet's surface. The two missions returned the first color pictures and extensive scientific information. Measured temperatures at the landing sites ranged from 150 to 250 K (−123 to −23 °C; −190 to −10 °F), with a variation over a given day of 35 to 50 °C (95 to 122 °F). Seasonal dust storms, pressure changes, and movement of atmospheric gases between the polar caps were observed. A biology experiment produced possible evidence of life, but it was not corroborated by other on-board experiments.

While searching for a suitable landing spot for Viking 2's lander, the Viking 1 orbiter photographed the landform that constitutes the so-called "Face on Mars" on 25 July 1976.

The Viking program was a descendant of the cancelled Voyager program, whose name was later reused for a pair of outer solar system probes.

Mars Pathfinder

"Ares Vallis" as photographed by Mars Pathfinder (click image for detailed description).

NASA's Mars Pathfinder spacecraft, launched one month after Global Surveyor, landed on 4 July 1997. Its landing site was an ancient flood plain in Mars' northern hemisphere called Ares Vallis, which is among the rockiest parts of Mars. It carried a tiny remote-controlled rover called Sojourner, which was the first acting Mars rover that traveled a few meters around the landing site, exploring the conditions and sampling rocks around it. Newspapers around the world carried images of the lander dispatching the rover to explore the surface of Mars in a way never achieved before.

Until the final data transmission on 27 September 1997, Mars Pathfinder returned 16,500 images from the lander and 550 images from the rover, as well as more than 15 chemical analyses of rocks and soil and extensive data on winds and other weather factors. Findings from the investigations carried out by scientific instruments on both the lander and the rover suggest that Mars was at one time in its past warm and wet, with water existing in its liquid state and a thicker atmosphere. The mission website was the most heavily trafficked up to that time.

Spate of failures

Conceptual drawing of the Mars Polar Lander on the surface of Mars.
Mars Spacecraft 1988–1999
Spacecraft Evaluation Had or was Lander
Phobos 1 No For Phobos
Phobos 2 No For Phobos
Mars Observer No No
Mars 96 No Yes
Mars Pathfinder Yes Yes
Mars Global Surveyor Yes No
Mars Climate Orbiter No No
Mars Polar Lander No Yes
Deep Space 2 No Yes
Nozomi No No

Mars 96, an orbiter launched on 16 November 1996 by Russia, failed when the planned second burn of the Block D-2 fourth stage did not occur. Following the success of Global Surveyor and Pathfinder, another spate of failures occurred in 1998 and 1999, with the Japanese Nozomi orbiter and NASA's Mars Climate Orbiter, Mars Polar Lander, and Deep Space 2 penetrators all suffering various terminal errors. Mars Climate Orbiter is infamous for Lockheed Martin engineers mixing up the usage of English units with metric units, causing the orbiter to burn up while entering Mars' atmosphere. Out of 5–6 NASA missions in the 1990s, only 2 worked: Mars Pathfinder and Mars Global Surveyor, making Mars Pathfinder and its little rover the only successful Mars landing in the 1990s.

Mars Express and Beagle 2

On 2 June 2003, the European Space Agency's Mars Express set off from Baikonur Cosmodrome to Mars. The Mars Express craft consisted of the Mars Express Orbiter and the lander Beagle 2. Although the landing probe was not designed to move, it carried a digging device and the smallest mass spectrometer created to date, as well as a range of other devices, on a robotic arm in order to accurately analyse soil beneath the dusty surface.

The orbiter entered Mars orbit on 25 December 2003, and Beagle 2 should have entered Mars' atmosphere the same day. However, attempts to contact the lander failed. Communications attempts continued throughout January, but Beagle 2 was declared lost in mid-February, and a joint inquiry was launched by the UK and ESA that blamed principal investigator Colin Pillinger's poor project management. Nevertheless, Mars Express Orbiter confirmed the presence of water ice and carbon dioxide ice at the planet's south pole. NASA had previously confirmed their presence at the north pole of Mars.

Signs of the Beagle 2 lander were found in 2013 by the HiRISE camera on NASA's Mars Reconnaissance Orbiter and the Beagle 2's presence confirmed in January 2015, several months after Pillinger's death. The lander appears to have successfully landed but not deployed all of its power and communications panels.

Mars Exploration Rovers

Shortly after the launch of Mars Express, NASA sent a pair of twin rovers toward the planet as part of the Mars Exploration Rover mission. On 10 June 2003, NASA's MER-A (Spirit) Mars Exploration Rover was launched. It successfully landed in Gusev Crater (believed once to have been a crater lake) on 3 January 2004. It examined rock and soil for evidence of the area's history of water. On 7 July 2003, a second rover, MER-B (Opportunity) was launched. It landed on 24 January 2004 in Meridiani Planum (where there are large deposits of hematite, indicating the presence of past water) to carry out similar geological work.

Despite a temporary loss of communication with the Spirit Rover (caused by a file system anomaly [3]) delaying exploration for several days, both rovers eventually began exploring their landing sites. The rover Opportunity landed in a particularly interesting spot, a crater with bedrock outcroppings. In fast succession, mission team members announced on 2 March that data returned from the rover showed that these rocks were once "drenched in water", and on 23 March that it was concluded that they were laid down underwater in a salty sea. This represented the first strong direct evidence for liquid water on Mars at some time in the past.

Towards the end of July 2005, it was reported by the Sunday Times that the rovers may have carried the bacteria Bacillus safensis to Mars. According to one NASA microbiologist, this bacteria could survive both the trip and conditions on Mars. A book containing this claim, Out of Eden by Alan Burdick, is due to be published in the United Kingdom. Despite efforts to sterilise both landers, neither could be assured to be completely sterile.[13]

Having been designed for only three-month missions, both rovers lasted much longer than planned. Spirit lost contact with Earth in March 2010. Opportunity, however, continued to carry out surveys of the planet, surpassing 45 km (28 mi) on its odometer by the time communication with it was lost in June 2018.[14][15] These rovers have discovered many new things, including Heat Shield Rock, the first meteorite to be discovered on another planet.

Here is some debris from a Mars landing, as viewed by a Rover. This shows the area around a heat shield and resulting shield impact crater. The heat shield was jettisoned during the descent impacting the surface on its own trajectory while the spacecraft went on to land the rover.

Phoenix

Camera on Mars orbiter snaps Phoenix suspended from its parachute during descent through Mars' atmosphere.

Phoenix launched on 4 August 2007, and touched down on the northern polar region of Mars on 25 May 2008. It is famous for having been successfully photographed while landing, since this was the first time one spacecraft captured the landing of another spacecraft onto a planetary body[16] (the Moon not being a planet, but a satellite).

Phoenix was followed by the Mars Science Laboratory, a rover more capable than Spirit and Opportunity. Originally the Mars Science Laboratory was intended for a launch during 2009 however, it was launched on 26 November 2011.

Russia launched Fobos-Grunt, a sample return mission to Phobos, along with the joint Chinese Yinghuo-1 Mars orbiter in November 2011, which went into Earth orbit successfully, but failed to launch to Mars.

Mars Science Laboratory

Mars Science Laboratory (and the Curiosity rover) descending on Mars

The Mars Science Laboratory (MSL) (and Curiosity rover), launched in November 2011, landed on Aeolis Palus, between Peace Vallis and Aeolis Mons ("Mount Sharp"), in Gale Crater on Mars on 6 August 2012, 05:17 UTC.[17][18] The landing site was in Quad 51 ("Yellowknife")[19][20][21][22] of Aeolis Palus near the base of Aeolis Mons. The landing site[23] was less than 2.4 km (1.5 mi) from the center of the rover's planned target site after a 563,000,000 km (350,000,000 mi) journey.[24] NASA named the landing site "Bradbury Landing", in honor of author Ray Bradbury, on 22 August 2012.[23]

ExoMars Schiaparelli

Model of Schiaparelli lander at ESOC
Main article: Schiaparelli EDM lander

The Schiaparelli lander was intended to test technology for future soft landings on the surface of Mars as part of the ExoMars project. It was built in Italy by the European Space Agency (ESA) and Roscosmos. It was launched together with the ExoMars Trace Gas Orbiter (TGO) on 14 March 2016 and attempted a landing on 19 October 2016. Telemetry was lost about one minute before the scheduled landing time,[25] but confirmed that most elements of the landing plan, including heat shield operation, parachute deployment, and rocket activation, had been successful.[26] The Mars Reconnaissance Orbiter later captured imagery showing what appears to be Schiaparelli's crash site.[27]

InSight

Phoenix landing art, similar to Insight

NASA's InSight lander, designed to study seismology and heat flow from the deep interior of Mars, was launched on 5 May 2018. It landed successfully in Mars's Elysium Planitia on 26 November 2018.[28]

Future missions

2020

Additional future missions are the Mars 2020 rover, the Chinese Mars Global Remote Sensing Orbiter and Small Rover, and the Indian Mars Orbiter Mission 2 orbiter. The ESA ExoMars rover, also planned for launch in 2020, should obtain soil samples from up to 2 metres (6 ft 7 in) depth and make an extensive search for biosignatures and biomolecules.

There is a proposal for a Mars Sample Return Mission by ESA and NASA, but this has been delayed until at least 2024. This mission would be part of the European Aurora Programme.

Landing site identification

As a Mars lander approaches the surface, identifying a safe landing spot is a concern.[29]

The inset frames show how the lander's descent imaging system is identifying hazards (NASA, 1990)

See also

References

Notes

  1. ^ The last Viking lander reverted to Earth-direct communications after both orbiters expired.

Citations

  1. ^ Reichhardt, Tony (August 2007). "Legs, bags or wheels?". Air & Space. Smithsonian. Retrieved 17 January 2015.
  2. ^ "Low-Density Supersonic Decelerator (LDSD)" (PDF). Press kit. Jet Propulsion Laboratory. May 2014.
  3. ^ a b Braun, Robert D.; Manning, Robert M. (2007). "Mars Exploration Entry, Descent, and Landing Challenges". Journal of Spacecraft and Rockets. 44 (2): 310–323. Bibcode:2007JSpRo..44..310B. CiteSeerX 10.1.1.463.8773. doi:10.2514/1.25116.
  4. ^ Wells, G. W., Lafleur, J. M., Verges, A., Manyapu, K., Christian III, J. A., Lewis, C., & Braun, R. D. (2006). Entry descent and landing challenges of human Mars exploration.
  5. ^ mars.nasa.gov. "Entry, Descent, and Landing | Landing". NASA's InSight Mars Lander. Retrieved 15 January 2019.
  6. ^ M, Malaya Kumar Biswal; A, Ramesh Naidu (23 August 2018). "A Novel Entry, Descent and Landing Architecture for Mars Landers". arXiv:1809.00062 [physics.pop-ph].
  7. ^ "Talking to Martians: Communications with Mars Curiosity Rover". Steven Gordon's Home Page. Retrieved 17 March 2017.
  8. ^ a b [1]
  9. ^ "NASA A Chronology of Mars Exploration". Retrieved 28 March 2007.
  10. ^ "NASA (NSSDC) Master Catalog Display Mars 3". Retrieved 28 March 2007.
  11. ^ "NASA (NSSDC) Master Catalog Display Mars 4". Retrieved 28 March 2007.
  12. ^ Советский грунт с Марса (in Russian) Archived 16 April 2008 at the Wayback Machine
  13. ^ "It's one small step for a bug, a giant red face for NASA". London: The Sunday Times (UK). 17 July 2005. Retrieved 17 June 2006.
  14. ^ Staff. "Opportunity's Mission Manager Reports August 19, 2014". NASA. Retrieved 14 February 2015.
  15. ^ "Mars Exploration Rover Mission: All Opportunity Updates". mars.nasa.gov. Retrieved 26 November 2018.
  16. ^ "Phoenix Makes a Grand Entrance". NASA. Retrieved 27 May 2008.
  17. ^ Wall, Mike (6 August 2012). "Touchdown! Huge NASA Rover Lands on Mars". Space.com. Retrieved 14 December 2012.
  18. ^ NASA Staff (2012). "Mars Science Laboratory – PARTICIPATE – Follow Your CURIOSITY". NASA. Retrieved 3 August 2012.
  19. ^ NASA Staff (10 August 2012). "Curiosity's Quad – IMAGE". NASA. Retrieved 11 August 2012.
  20. ^ Agle, DC; Webster, Guy; Brown, Dwayne (9 August 2012). "NASA's Curiosity Beams Back a Color 360 of Gale Crate". NASA. Retrieved 11 August 2012.
  21. ^ Amos, Jonathan (9 August 2012). "Mars rover makes first colour panorama". BBC News. Retrieved 9 August 2012.
  22. ^ Halvorson, Todd (9 August 2012). "Quad 51: Name of Mars base evokes rich parallels on Earth". USA Today. Retrieved 12 August 2012.
  23. ^ a b Brown, Dwayne; Cole, Steve; Webster, Guy; Agle, D.C. (22 August 2012). "NASA Mars Rover Begins Driving at Bradbury Landing". NASA. Retrieved 22 August 2012.
  24. ^ "Impressive' Curiosity landing only 1.5 miles off, NASA says". Retrieved 10 August 2012.
  25. ^ "ExoMars TGO reaches Mars orbit while EDM situation under assessment". European Space Agency. 19 October 2016. Retrieved 19 October 2016.
  26. ^ EXOMARS 2016 – SCHIAPARELLI ANOMALY INQUIRY. May 2017
  27. ^ Chang, Kenneth (21 October 2016). "Dark spot in Mars photo is probably wreckage of European spacecraft". New York Times. Retrieved 26 November 2018.
  28. ^ "NASA InSight Lander Arrives on Martian Surface". NASA’s Mars Exploration Program. Retrieved 26 November 2018.
  29. ^ [2]
Retrieved from "https://en.wikipedia.org/w/index.php?title=Mars_landing&oldid=947596721"